Balsawood strop and a small bottle of oxide.

Hi,

I just purchased a balsawood strop and a small bottle of chromium oxide paste to use on it, how many strops should I perform on this with the oxide to get my dulled razor sharp again, can I do harm to the razor if I strop too many times using the chromium oxide so is there a limit, also should I tape the spine of the razor?

Thanks.